Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5948778.

This is a "bengine" with a ring for your keychain. so you can have it where ever you go (Unless you forget your keys of course). No parts have been modified. I just attached a half torus to the side.

Update! Now modified in fusion 360! (because is tinkercad imports get simplified). Update! Extended keychain ring! (Because I found out it was hard to put it on;) ).